I was lucky enough to be raised by a wonderful mother who, like so many heroic single mothers, never allowed my father's absence to be an excuse for me to slack off or not always do my best.

很幸运的是我有一个非常棒的母亲抚养我成长，她像许多英勇的单身母亲那样，从不允许自己以父亲的缺席作为借口而怠慢我。

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That is to say, when humans evolved without a particular switch, the absence of that switch allowed the brain to grow further.

也就是说，人类在进化中丢弃了这个特殊的开关，而这个缺失的开关让大脑能发育更高级。

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The study found that monarch butterflies have an internal sense of direction that allowed them to get from one point to another even in the absence of light by sensing the Earth's magnetic field.

有研究发现帝王蝶有方向感，可以让他们在没有光的情况下，通过磁场感应的方式，它们能精确的从某处飞到另一个地方。

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The absence of tight oversight has allowed makers of herbal products to flourish, particularly in Utah, where the dry desert air helps keep raw materials and pills and capsules fresh, and where land and skilled labor have been relatively inexpensive.

CNN: ASIANOW - TIME Asia

The complete absence of a black middle class allowed most advertisers to ignore black tastes and aspirations.

ECONOMIST: Free at last

They argued that it was the absence of unions at charter schools that allowed administrators to make quick changes to staffing and scheduling in the pursuit of innovation.

FORBES: Will Conservatory Lab Charter School Stay Unionized?